JPH01125748A - Magnetic recording/reproducing device - Google Patents

Abstract

PURPOSE:To mount a reference type tape cassette and a small tape cassette on one device by providing a light emitting element so as to be displaced to a position being fitted in respective tape cassette corresponding to the kind of the tape cassette to be mounted on the device. CONSTITUTION:The light emitting element 35 which emits detecting light to sensors 81 and 82 for detecting a tape end is provided displaceably at the position to be fitted in respective tape cassette corresponding to the kind of the tape cassette being mounted on the device 1. In other words, since the light emitting element is displaced to the position to be fitted in the recessed part of the tape cassette corresponding to the size of the tape cassette mounted on the device, the selective mounting of the reference type tape cassette or the small tape cassette is not interfered by the light emitting element 35 even when they are mounted. In such a way, it is possible to mount the reference type tape cassette and the small tape cassette directly.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a magnetic recording/reproducing device, and in particular to a magnetic recording/reproducing device designed to accommodate tape cassettes of different sizes.
Regarding reproduction device δ.

Conventional technology For example, in a magnetic recording/reproducing device such as a video tape recorder, when a tape cassette is installed in the device, a tape loading member fits into the tape cassette, and the tape loading member moves along a guide groove.
The tape in the tape cassette is pulled out and wound around the outer periphery of the rotating drum for magnetic recording/reproduction.

The tape cassette installed in the video tape recorder has, for example, the external shape and size of the casing, the four-part shape into which the tape loading member, tape tension ball, etc. fit, the shape of the tape reel, and the difference between the supply side and take-up side. The distance between tape reels, etc. has been standardized. Therefore, in a magnetic recording/reproducing device, a non-standard tape cassette that is different from a standard tape cassette cannot be inserted into the device.

However, small tape cassettes that are smaller than the standard tape cassettes mentioned above are used for video cameras.
In order to attach this small tape cassette to a device for standard tape cassettes, a separate adapter is prepared, and the small tape cassette is attached via this adapter.

Problems to be Solved by the Invention However, as described above, in order to attach a small tape cassette to a device for standard tape cassettes, it is necessary to use the adapter, and it is also necessary to load the small tape cassette into the adapter. After that, the adapter has to be attached to the device, so in conventional devices, there is a problem that the operation of attaching the small tape cassette is troublesome.

In particular, the positions of the tape loading member and tape tension ball when installing a tape cassette are different between a standard tape cassette and a small tape cassette, so it is now possible to directly install a standard tape cassette and a small tape cassette into one device. It was difficult to do.

Therefore, a tape loading member for winding the tape in a tape cassette around a rotating drum is provided so as to be movable to a first unloading position where it fits into a standard tape cassette or a second unloading position where it fits into a small tape cassette. Therefore, it is being considered that a standard tape cassette and a small tape cassette can be installed in one device.

However, an optical sensor is provided in the device to optically detect the end of the tape when the tape is wound, and a light emitting element such as a light emitting diode or the like is provided on the chassis to fit into the tape cassette. Therefore, in a device that allows tape cassettes of different sizes and shapes to be loaded, it is desired that the light emitting element be placed in a position that does not interfere with the loading operation of standard tape cassettes and small tape cassettes. ing.

Therefore, an object of the present invention is to provide a magnetic recording/reproducing device that meets the above-mentioned demands.

Means and Effects for Solving the Problems The present invention is a magnetic recording/reproducing device in which multiple types of tape cassettes of different sizes are selectively loaded, and in which a detection light is emitted to a sensor for detecting a tape end. The light emitting element is provided so as to be displaced to a position where it fits into each tape cassette depending on the type of tape cassette installed in the device, and the light emitting element for detecting the tape end can be used to detect tapes of different sizes and shapes. This is designed so as not to interfere with the cassette loading operation.

Embodiment FIGS. 1 and 2 show an embodiment of the magnetic recording/reproducing apparatus according to the present invention.

In both figures, a magnetic recording/reproducing device 1 is directly loaded with a standard tape cassette 2 (indicated by a dashed line in Fig. 1) or a small tape cassette 3 (indicated by a dashed line in Fig. 4). It is configured so that it can be done.

Before explaining the configuration of the apparatus 1, the standard tape cassette 2 and the small tape cassette 3 will be explained first.

The standard tape cassette 2 has a housing 2 as shown in FIG.
A supply side reel and take-up side reel (both not shown)
12G is provided on the front surface of the housing 2a to protect the front tape path 2b. In addition, the bottom of the housing 2a has a hub hole 2d for the supply reel, a hub hole 2e for the W-shaped steel reel,
A hole 2f into which a light emitting element 35 for tape end detection is inserted is open. Further, on the front side of the bottom of the casing 2a, there is a recess 2Q into which a guide roller 10b, an inclined ball 10c, and a q-tension ball 13a of a loading member 10 on the supply side, which will be described later, are fitted, and a recess 2Q where a loading member 11 on the winding side, which will be described later, is fitted. A recess 2h into which the guide 0-ra 11b, the inclined ball 11C, the half-loading ball 25, and the guide ball 23 are fitted is formed.

Further, holes 21 are provided on both sides of the housing 2a through which light from a light emitting element 35 for detecting a tape end passes, which will be described later.

As shown in FIGS. 4(A) and 4(B), the small tape cassette 3 is placed on the front of the housing 3a! 13b, and a hub hole 3C for a take-up reel (not shown) is opened at the bottom. Further, a part of a gear 3d, which is provided integrally with a take-up reel (not shown), is exposed at the bottom and side surfaces of the housing 3a.

Further, on the front side of the bottom of the small tape cassette 3, there is a recess 3f into which a guide roller 10b, an inclined ball 10c, and a tension ball 13a on the supply side, which will be described later, are fitted, and a guide roller 11b, an inclined ball 11C, and a half loading on the winding side, which will be described later. Four parts 3g into which the ball 25 fits, and a recess 3h into which the guide ball 23 and the light emitting element 35 fit are formed.

In this way, the standard tape cassette 2 and the small tape cassette 3 not only differ in size and external shape, but also differ in the distance between the supply reel and the take-up reel.
Furthermore, the method of driving the take-up reel is also different.

To install such a standard type tape cassette 2 and a small tape cassette 3 in the same device 1, as shown by the broken line in FIG. 4(C), the hub hole 2d on the supply side of the standard type tape cassette 2 and the hub hole 3C of the small tape cassette 3 are aligned.

As a result, the fourth part 3f of the small tape cassette 3.

3Q and 3h are the recesses 2g of the standard tape cassette 2.

It will be located inside the tape cassette from 2h.

Next, a schematic configuration of the device 1 will be explained.

As shown in FIG. 1, a drum base 5 is mounted and fixed on the chassis 4, and a rotating drum 6 having a magnetic head (not shown) is provided on the drum base 5. Further, arc-shaped guides @7.8 are bored in the chassis 4 on both the left and right sides of the rotating drum 6.

This guide? 117.8 corresponds to the mounting position of the standard type tape cassette 2 shown in FIG. 3 and the mounting position of the small tape cassette 3 shown in FIG. 4, and is extended toward the tape cassette side compared to the conventional device. In addition, the tape winding side (right side)
The guide groove 8 is formed longer than the guide groove 7 on the tape supply side (left side).

10.11 is a tape loading member, and guide groove 7.
Insert a bottle (not shown) on the bottom side into the guide groove 7.
Loading base 1 movably provided along 8
0a, 11a, guide rollers 10b, 11c vertically extending from the loading bases 10a, 11a, and the loading base 10a.

An inclined ball 10c projects obliquely from 11a.

11C. Also, tape loading member 10.
11 is driven by a loading drive mechanism 9, which will be described later, and moves to the first unloading position (shown in FIG. 1) where it fits into the tape cassette 2 when the standard tape cassette 2 is loaded, and also moves the small tape cassette 2 to the first unloading position (shown in FIG. 1). When the tape cassette 3 is loaded, it moves to the second unloading position (shown in FIG. 5(A)) where it is inserted into the small tape cassette 3.

Further, the drum base 5 is provided with V-shaped stoppers 5a and 5b that protrude above the guide groove 7.8, and the tape loading member 10.11 is moved along the guide groove 7.8 as described later. Arrow A.

When moving in the B direction (shown in FIG. 1), the stopper 5a
, 5b and stops at the tape loading completion position.

Note that a plate spring 12 that protrudes in the traveling direction is attached to the loading base 10a of the tape loading member 10 on the tape supply side.

Reference numeral 13 denotes a tension arm, which has a vertical tension ball 13a at its tip and is supported by a shaft 4a on the chassis 4. Further, one end of a coil spring 14 (indicated by a broken line in FIG. 1) is hooked to the arm portion 13b of the tension arm 13, and the other end of the coil spring 14 (indicated by a broken line in FIG. It is rotated counterclockwise by tensile force. Therefore, when the tape loading member 10 on the supply side is within its rotation range, the tension arm 13 contacts the loading base 10a and rotates following the movement of the loading base 10a.

Also, links 15a, 1 are provided in the middle of the tension arm 13.
A toggle member 15 is rotatably connected to the toggle members 5b in a dogleg shape, and one end of a brake band 16 is locked to this toggle member 15. The other end of the brake band 16 is a fixed member 17 fixed to the chassis 4.
The reel stand 18a is engaged with the reel stand 18a on the supply side and faces the outer periphery of the reel stand 18a on the supply side.

The toggle member 15 is configured to be displaced in a dogleg shape as shown in FIG. 1, but not in the opposite direction. Therefore,
When the loading member 10 is in the first and second unloading positions as shown in FIGS. 1 and 5(A),
The toggle member 15 is displaced in a dogleg shape and the brake band 16
It absorbs the excess slack. Therefore, the brake band 16 does not slacken significantly and is spaced apart from the reel stand 18a.

A full-width erase head 19 is placed and fixed on the erase base 20. The erase base 20 is rotatably supported by a shaft 20a, and has an impedance of O° on its upper surface.
- A roller 21 and a guide ball 22 are provided.

23 is a guide ball that stands vertically at the tip of the guide arm 24. 25 is a half-loading ball that stands vertically from the tip of the half-loading arm 26. The guide ball 23 and the half zeroing ball 25 are driven by a ball moving mechanism 27 (to be described later), and the arm 24.26 is driven by a ball moving mechanism 27, which will be described later. Unloading position fi! (as shown in FIG. 1) or a second unloading (as shown in FIG. 5) that fits into the small tape cassette 3.

Reference numeral 28 denotes a guard ball that prevents the tape from sliding against the rotating drum 6 during half-loading, and extends vertically from the tip of the guard ball arm 29.

Note that the guide ball 23, half-loading ball 25, and guard ball 28 are displaced according to each mode, and details will be described later.

Reference numeral 30 denotes a capstan, which is rotated counterclockwise by a capstan motor 30a (indicated by a broken line in FIG. 1) disposed on the bottom side of the chassis 4.

31 is the pinch row arm, arc-shaped pinch 0-ra arm 3
2 is rotatably supported at the tip of the pinch roller arm 32, and is pressed onto the capstan 30 by the upward and downward rotation of the pinch roller arm 32 and the horizontal rotation of the base 33 that supports the pinch roller arm 32 during recording/reproduction. do.

Details of the pinch roller drive mechanism 34 that operates the pinch roller 31 in this manner will be described later.

Reference numeral 35 denotes a light emitting element for detecting the end of the tape, such as a light emitting diode, and is provided on a ball 36a extending perpendicularly from the tip of an arm 36 supported by a shaft 4b on the chassis 4. Note that the arm 36 is urged to rotate counterclockwise by the tensile force of a coil spring 37. Normal arm 3
6 is in contact with a pin 4C protruding from the chassis 4, and is located at a first position (first
(as shown in the figure).

Also, when the small tape cassette 3 is installed, the arm 36
is pressed by the arm 24 rotating counterclockwise, and the light emitting element 35 is displaced to the second position (shown in FIG. 5) where it fits into the small tape cassette 3.

As shown in FIG. 1, tape end detection sensors 81 and 82 for receiving light from the optical collector 35 are provided on both sides of the mounting position of the standard tape cassette 2. A transparent leader tape (not shown) is provided at the supply end of the tape wound in the standard tape cassette 2 and the small tape cassette 3, and a transparent trailer tape is provided at the take-up end of the tape. A tape (not shown) is provided.

Normally, light does not pass through the tape where the magnetic film is formed, so the light from the light emitting element 35 is transmitted to the sensor 8.
It does not reach 1.82.

However, for example, when the tape is wound on the take-up reel,
When the trailer tape reaches between the light emitting collector 35 and the sensor 81, the light from the light emitting element 35 passes through the trailer tape, so the sensor 81 receives the light from the light emitting element 35. As a result, the sensor 81 outputs a trailer tape detection signal (i), and upon receiving this signal, the control circuit (not shown) stops the rotation of the take-up side roll stand 18b.

Further, when the tape is rewound onto the supply reel and the leader tape reaches between the light emitting element 35 and the sensor 82, the light from the light emitting element 35 passes through the leader tape and enters the sensor 82. Therefore, the sensor 82 outputs a leader tape detection signal, and the open/close circuit stops the rotation of the supply side reel stand 18a.

The general configuration of the magnetic recording/reproducing apparatus 1 has been explained above, and next, each mechanism for operating each member will be explained in detail.

■ [Loading Drive Mechanism] As shown in FIG. Gear 41 integrated with pulley 40
．． Worm gear 4 via gear 42 meshing with gear 41
3. A main cam gear 44 and a worm gear 43 mesh with the worm gear 43 from the horizontal direction.
A sub cam gear 45 that meshes vertically with rotates.

As shown in FIG. 6, the main cam gear 44 is rotated by a main gear 44' that is integral with the main cam gear 44.

It is transmitted via gears 46.47, 48.49 to a ring gear mechanism 50 which drives the loading member 10.11.

This ring gear mechanism 50 is disposed below the rotating i-ram 6, and includes a ring gear 50a meshing with the gear 49, and ring gears 50b and 5 disposed above the ring gear 50a.
0c.

Each ring gear 50a, 50b, 50cGL is rotatably supported coaxially by three rollers 51a, 51b, 51c that are in sliding contact with the inner peripheral side.

Further, as shown in FIGS. 5(A) and 7(A), the base 10a of the tape loading member 10 on the supply side is connected to a ring gear 50a via a connecting member 55. Note that one end of the connecting member 55 is connected to a sliding member 57 that is biased in the direction of arrow C by the tensile force of a coil spring 56 that is slidably provided on the ring gear 50a.

Further, as shown in FIGS. 5(A) and 7(C), the base 11a of the tape loading member 11 on the winding side is connected to the ring gear 50C via a connecting member 58.

The connecting member 58 is connected to a sliding member 59 that is slidably provided on the ring gear 50c, and the sliding member 59 is biased in the direction indicated by the arrow by the tensile force of the coil spring 60.

Therefore, the loading members 10, 11 move into the guide groove 7 with the rotation of the ring gears 50a, 50b, 5oc, respectively.
．． Move along 8.

The rotation of the ring gear 50a is controlled by the gear 52. The signal is transmitted to the ring gear 50b via a gear 53a that meshes with the gear 52 and a gear 53b that is integrated with the gear 53.

Further, the rotation of the ring gear 50a is controlled by the gear 52. A small diameter gear 54a that meshes with the gear 52, and a gear 54 that is integrated with the gear 54a.
Furthermore, as shown in FIGS. 7(A), (B), and (C), the ring gear 50a has a gear portion 50 that meshes with the gear 49 on the outer periphery of the ring gear 50a.
a1 is formed within the range of angle α. Further, a gear portion 50b1 that meshes with the gear 53b is provided on the outer periphery of the ring gear 50b.
is formed within the range of angle β. Also, ring gear 50
A gear portion 50c1 that meshes with the gear 54b is formed on the outer periphery of c in a range of angular variation γ.

As shown in FIG. 5(B), the ring gears 50b and 50c are stacked one on top of the other and are combined into one body.

The ring gears 50b and 50c are shown in FIG. 7(B), (
Since V4 is overlapped as it is in the state shown in C), the gear part 5
Parts of 0b1 and 50c1 overlap, and the teeth of each gear portion 50b+ are integrated with the teeth of 50C1 by matching their pitches.

Since the ring gear 50a is driven by the gear 49, the loading member 10 rotates at a constant speed from the unloading position to the loading completion position. However, the ring gear 50b.

50c is driven at a constant speed via gears 53a and 53b (reduction ratio=1) until the loading member 11 reaches the half-loading position from the unloading position, and from the half-loading position to the loading completion position, as will be described later. is accelerated and driven via gears 54a and 54b (reduction ratio: 1).

In this way, the ring gears 50b and 50c that move the tape loading member 11 on the take-up side are accelerated from the half-loading position and move from the guide groove 7 on the supply side to the take-up side, as shown in FIG. This is because the guide groove 8 has a longer overall length, and the tape loading member 10.1
This is to ensure that the two terminals reach the loading completion position at approximately the same time.

The tape loading member 10.11 moves from the first or second unloading position to the half-loading position by the rotation of each of the ring gears 50a, 50b, and 50c.
While moving to the loading completion position, the tape in the tape cassette 2.3 is pulled out and wound around the rotating drum 6.

Further, by reverse rotation of the ring gears 50a, 50b, and 50c, the tape is returned from the loading completion position to the first or second unloading position, and the tape is returned to the tape cassette 2.3.

■ "Ball Moving Mechanism" As shown in FIGS. 1 and 2, the lower surface of the main cam gear 44 that meshes with the worm gear 43 is shown in FIGS.
Cam grooves 44a and 44b shown in D) are formed.

A pin 61a of a slide lever 61 slidably provided in the directions of arrows X+ and X2 is fitted into one cam groove 448, and a pin 62a of a swing arm 62 is fitted into the other cam groove 44b.

The slide lever 61 has a bottle 61b vertically extending from the other end of the slide lever 61, and a leaf spring 63 that holds the bottle 61b.
It is connected to the fan-shaped gear 63 via a. The sector gear 63 is rotatably supported by a pin 4d on the chassis 4.

Therefore, when the cam gear 44 rotates counterclockwise, the slide lever 61 slides in the direction of arrow X+ according to the rotation position of the cam groove 44b, and the sector gear 63 rotates clockwise accordingly. Furthermore, the rotation of the fan-shaped gear 63 is transmitted to the gear 24a of the arm 24 via the gear 64, as shown in FIG.

As a result, the arm 24 rotates in the g1 direction, and the arm 24 rotates in the g1 direction.
The guide ball 23 provided at the tip of 4 is shown in FIG. 9(a).
As shown in the cam diagram, as the main cam gear 44 rotates, it is displaced to a position corresponding to each mode.

Further, the rotation of the fan-shaped gear 63 is caused by the rotation of the gear 6 which meshes with the gear 64.
5a1 is transmitted to the gear 26a of the arm 26 having the half-loading ball 25 through a small diameter gear 65b1 which is integrated with this gear 65a and a gear 66 meshing with the small diameter gear 65b. Therefore, the arm 26 rotates according to the rotation position of the cam groove 44b, and the half-loading ball 25 moves to the ninth position.
As shown in the cam diagram in Figure (a), as the main cam gear 44 rotates, it is displaced to a position corresponding to each mode.

Further, the swing arm 62 is connected to a pin 67a of a swing gear 67 via a leaf spring 62b. The swing gear 67 is rotatably supported by the pin 4e, and the swing gear 67 is rotatably supported by the pin 4e.
It meshes with the Also, the swing gear 67 is a coil spring 6.
It is rotated counterclockwise by the tensile force of 9.

Therefore, as the cam gear 44 rotates clockwise,
The swing arm 62 that engages with the cam groove 44a rotates counterclockwise. As the swing arm 62 rotates, the swing gear 67 rotates clockwise, and the rotation is caused by the rotation of the gear 68.
Gear 2 of arm 29 with guard ball 28 through
9a. Therefore, the arm 29 has the cam groove 44a.
As shown in the cam diagram of FIG. 9(b), the guard ball 28 is displaced to a position corresponding to each mode as the main cam gear 44 is rotated.

■ [Pinch Roller Drive Mechanism] As shown in FIG.
a, and is rotated upward by the elastic force of a torsion spring (not shown) wound around the shaft 33a. Therefore, the arm 32 rotates so that the pinch roller 31 moves upward. Also, the base 33 is the chassis 4
It is rotatably supported at the top.

As shown in FIG. 10, the upper surface of the main cam gear 44 is provided with a cam groove 44c for pinch row rotation and a cam groove 446 for pinch roller compression.

A pin 70a of a slide lever 70 that is slidable in the directions of arrows Y+ and Yzh is fitted into this cam groove 44c. Moreover, the intermediate portion is rotatably supported on the slide lever 70! One end of the moving member 71 is connected 1, and the other end of the rotating member 71 is connected to a slide rack 72 that slides in the directions of arrows Y+ and Y2.

The slide rack 72 has a rack 72a that meshes with the gear 33b of the base 33.

In addition, an arm 73 is provided in the cam groove 44d for pinch roller compression.
The arm 73 is connected to two plates 74 and 75 supported by the bin 4f. These two plates 74 and 75 are integrated by the tension of a coil spring 76.

The plate 75 is also provided with a bent portion 75a which comes into contact with the protruding pin 32a (shown in FIG. 2) at the intermediate portion of the arm 32 when the pinch roller arm 32 rotates. As will be described later, this bent portion 75a presses the pin 32a of the pinch roller arm 32 through the spring force of the spring 76 during recording/reproduction, and presses the pinch roller 31 against the capstan 30.

Further, the sub cam gear 45 that meshes with the worm gear 43 in the vertical direction is a cam ig 45 a as shown in FIG.
has. This cam*45a has up/down arm 7.
7 is engaged, and the up-down arm 7
7 is rotatably supported by a bracket 78.

Furthermore, a roller 77b is provided at the end of the up-down arm 77.

The pinch roller arm 32 is rotationally biased so that the abutting portion 32b at the end abuts against the roller 77b of the up-down arm 77. Therefore, when the sub cam gear 45 rotates counterclockwise and the bin 77a moves inward, the up-down arm 77 rotates counterclockwise. and,
The pinch roller arm 32 rotates as the contact portion 32b is pressed upward by the roller 77a of the up-down arm 77, and the pinch roller 31 is lowered.

As shown in FIGS. 1 and 2, a reflection pattern (not shown) is formed on the front surface 45b of the cam gear 45 in order to detect the rotation angle for each mode. Additionally, three optical sensors are provided at positions facing the front surface 45b of the cam gear 45.
179 is provided, and the rotational position of the cam gear 45 is detected by a combination of detection signals obtained from the optical sensor 79 of 31[1. Note that since the main cam gear 44 and the cam gear 45 have the same diameter, the rotational position of the main cam gear 44 can also be detected from the detection signal of the optical sensor 79.

■ "Tension arm, erase base operation mechanism" As shown in Figs. 1 and 5, the tension arm 13 is operated by the tension of the spring 14 to move the
0a, and the loading base 10a moves to the first unloading position (tension ball 13
a is inserted into the recess 2q of the standard type Arp cassette 2) or a second unloading position (the position where the tension ball 13a is inserted into the recess 3f of the small tape cassette 3).

Therefore, the tension arm 13 is connected to the loading base 1.
0a moves in the direction of the arrow claw and rotates counterclockwise by the spring force of the spring 14.

As shown in FIG. 12, when the loading base 10a further moves in the direction of the arrow claw, the tension arm 13 moves upward! The leaf spring 12 extending in the advancing direction slides while pressing the lower moving surface 20t of the erase base 20 (indicated by a broken line in FIG. 12).

Therefore, the erase base 20 rotates counterclockwise around the shaft 20a, and its end 20c is attached to the tension arm 1.
3. Therefore, the tension arm 13 is pressed against the end portion 20C of the erase base 20.

Furthermore, when the loading base 10a moves in the direction of the arrow claw and reaches the loading completion position, the loading base 10a passes the erase base 20, so the erase base 20 rotates in the direction of the shadow 1 and returns to its original position. . As will be described later, the tension arm 13 further rotates counterclockwise from the position shown in FIG. 12 to fit the tension ball 13a into the four parts 2Od of the erase base 20. As a result, the tension arm 13 reaches the 4D position that forms the tape bus during recording/playback, and also extends the toggle member 15 linearly to extend the brake band 16.
is brought into sliding contact with the reel stand 18a on the supply side.

Furthermore, when returning from the loading completion state to the unloading position, the loading base 10a performs the opposite operation to the above, and the loading base 10a
When the loading base 10a returns, the plate spring 12 of the loading base 10a presses the sliding surface 20b of the erasing base 20. At that time, the erase base 20 rotates counterclockwise, and the end 20
G kicks the tension arm 13, and as a result, the tension arm 13 rotates clockwise, causing the tension ball 13a to be released from the recess 20d.

('l) Next, the operation in each mode when the standard tape cassette 2 is loaded in the magnetic recording/reproducing apparatus having the above structure will be explained.

As shown in Fig. 1, a standard tape cassette 2 (in Fig. 1,
When a cassette (indicated by a dashed line) is inserted into the apparatus, a cassette detection switch (not shown) detects the type of cassette. The motor 38 is rotated by a command from a control circuit (not shown), and rotates the worm gear 43 as described above.

The main cam gear 44 is driven by the worm gear 43,
Rotate 90 degrees clockwise as shown in FIG. 8(B).

This rotation of the main cam gear 44 is transmitted to the ring gear mechanism 50 as explained in the above-mentioned section (2) [Loading drive mechanism]. As a result, ring gear 50a rotates clockwise, and ring gears 50b and 50c rotate counterclockwise. The loading member 10.11 then reaches the first loading position shown in FIG.

In addition, as explained in the above section ``Ball moving mechanism'', the ball moving mechanism 27 rotates as the main cam gear 44 rotates.
is operated to rotate arms 24,26 to the first unloading position shown in FIG. Also, tension arm 1
3 follows the loading member 10 and rotates to the first unloading position.

Note that the light emitting element 35 is in the first position where the arm 36 contacts the stopper 4C due to the spring force of the spring 37.

Therefore, when the standard tape cassette 2 is lowered to a predetermined mounting position in the device, the guide balls 10b, 11b1 of the loading member 10°11, the inclined balls 10G, 11C,
The tension ball 13a1, guide ball 23, and half-loading ball 25 fit into the recesses 2Q and 2h of the standard tape cassette 2 shown in FIG. Also, reel stand 1
8a.

The upper part of 18b is the hub hole 2d of the standard tape cassette 2,
At the same time, the light emitting element 35 is fitted into the hole 2f.

Next, as shown in FIG. 8(C), the rotation of the motor 38 causes the main cam gear 44 to further rotate in the clockwise direction.

Therefore, the ring gear 50a.

50b and 50c are further rotated, and the tape loading member 10.11 is separated by a small distance from the recesses 2Q and 2h of the standard tape cassette 2, and moves to the half loading position ia (shown in FIG. 13). . Further, the tension arm 13 follows the tape loading member 10 and leaves the recess 2g.

Furthermore, the guide ball 23 and the half-loading ball 25 that had been fitted into the recess 2h are moved toward the arrow x1 by the slide lever 61 that engages with the cam groove 44b of the main cam gear 44.
As it slides in the direction, it is displaced to the position shown in FIG. 13 with the arms 24, 26 rotating clockwise.

Therefore, the tape 80 pulled out from the standard type tape cassette 2 has a guide ball 10b, a guard ball 28°, a half-loading ball 25. A tape bus is formed which returns into the tape cassette 2 via the guide ball 23. Note that the tape 80 passes through a position spaced apart from the outer periphery of the guide drum 6 because the guard ball 28 has not yet been displaced and is positioned at the top of the rotary drum 6. Note that during half loading, the pinch roller 31 continues to move upward.

Further, as shown in FIG. 8(C), during half loading, the pin 6 of the swing arm 62 engages with the cam groove 44a.
Since the swing arm 2a is located in the wide portion 44a1, the swing arm 62 can rotate slightly clockwise. Therefore, the arm 29 having the guard ball 28 can be rotated counterclockwise by the spring force of the spring 69 that biases the swing gear 67, thereby applying tension to the tape 80.

Here, the recording or playback mode is operated. This record/
The regeneration mode operation causes the motor 38 to further rotate, causing the main cam gear 44 to rotate clockwise as shown in FIG. 8(D).

As the main cam gear 44 rotates, the pin 62a of the swing arm 62 that engages with the cam groove 448 is displaced inward, so the swing arm 62 rotates counterclockwise. Therefore, the arm 29 having the guard ball 28 is
As shown in FIG. 4, the loading member 11 is rotated largely clockwise to a position where it does not interfere with the movement of the loading member 11.

Main gear 44', which is integral with main cam gear 44, also rotates in the same direction, thereby causing ring gear 50a to further rotate clockwise and ring gears 50b and 50C to rotate counterclockwise. At this time, as described above, the gear portion 50b of the ring gear 50b and the gear 53b are disengaged, and the gear portion 50c1 of the ring gear 50G is disengaged.
The gear 54b meshes with the gear 54b. Therefore, the loading member 10 on the supply side moves in the direction of the arrow B along the guide groove 7, and the O-ding member 11 on the winding side is further accelerated and moves in the direction of the arrow B along the guide groove 8.

Therefore, as shown in FIG. 14, the loading members 10, 11 abut on the stoppers 5a, 5b substantially simultaneously while wrapping the tape 80 around the outer periphery of the rotating drum 6, respectively.

Loading base 10 in contact with stoppers 5a and 5b
a and 11b are ring gears 50a, respectively.

The spring force of the coil springs 56 and 60 provided at 50G suppresses and holds the stoppers 5a and 5b.

As the loading member 10 on the supply side moves to the O-ding completion position shown in FIG. It is displaced between the row 521 and the guide ball 22.

Therefore, the links 15a and 15b of the toggle member 15 connected in the middle of the tension arm 13 become straight.

Therefore, the tension arm 13 applies pack tension to the tape 80 by bringing the brake band 16 into sliding contact with the outer periphery of the reel stand 18 on the supply side via the toggle member 15.

Furthermore, as the main cam gear 44 rotates, the sub cam gear 45 (shown in FIG. 11) that meshes with the worm gear 43 rotates counterclockwise.

Therefore, as described above, the tape loading member 11 moves in the direction of arrow B along the guide groove 8, and the pinch roller 31 moves in the direction of arrow B.
After passing below, the up-down arm 77 rotates in the counterclockwise direction along the cam *45a of the sub-cam gear 45, as shown in the cam diagram of FIG. 9(C). Therefore, the contact portion 32b of the pinch roller arm 32 is pressed by the roller 77b of the up-down arm 77 and moves once.

Therefore, the pinch roller arm 32 rotates about the shaft 33a and lowers the pinch roller 31.

Also, the cam groove 440° 44 on the top side of the main cam gear 44
d also rotates in the cutting direction as shown in FIG. 10(B), so the pin 70a of the slide lever 70 is displaced inward along the cam groove 44c, and the slide lever 70 is displaced in the direction of arrow Y2. .

Further, since the pin 73a of the arm 73 is displaced in the outer circumferential direction along the cam groove 44d, the arm 73 rotates clockwise.

Therefore, as shown in FIG. 9(C), after the pinch roller 31 descends, the slide lever 70 slides in the direction of arrow Y2, and this displacement is transferred to the slide rack 7 via the rotating member 71.
2. That is, the slide rack 72 is moved in the direction of arrow Y1.
slide in the direction.

Therefore, the base 33 that engages with the rack 72a of the slide rack 72 rotates counterclockwise, and the pinch roller 31
The tape 80 is brought into contact with the capstan 30. Thereafter, as shown in FIG. 9(D), the arm 73 rotates clockwise, thereby causing the pair of plates 74 and 75 to rotate counterclockwise. As a result, the bent portion 75a of the plate 75 comes into contact with the protruding pin 32a of the pinch roller arm 32, and the spring force of the spring 76 biases the arm 32 counterclockwise.

In this manner, the tape 80 is pressed toward the cab-stan 30 side by the pinch roller 31 while traveling toward the take-up side, and is recorded or reproduced.

At this time, when the tape 80 is wound onto the take-up reel, the light from the light emitting element 35 passes through the trailer tape and enters the tape end detection sensor 81 as described above. The tape end detection sensor 81 receives light from the light emitting element and outputs a trailer tape detection signal.

Note that the unloading operation is the opposite of the loading operation described above.

(2) Next, the case of mounting the small tape cassette 3 will be explained.

As shown in FIG. 5(A), the small tape cassette 3 (fifth
When a tape cassette (indicated by a two-dot chain line in the figure) is inserted into the apparatus, a cassette detection switch (not shown) detects that it is a small tape cassette.

Then, the motor 38 reversely rotates the worm gear 32 in response to a command from a control circuit (not shown), and rotates the main cam gear 4.
4 to the position shown in FIG. 8(A).

Due to the reverse rotation of the worm gear 32, the ring gear mechanism 50
The ring gear 50c rotates clockwise, and the other ring gears 50b and 50G rotate counterclockwise. Therefore,
The loading member 10.11 moves toward the small tape cassette 3 from the first unloading position shown in FIG.

As the loading base 10a on the supply side moves, the tension arm 13 rotates clockwise and reaches the second unloading position shown in FIG. 5(A). Further, due to the rotation of the cam groove 44b on the lower surface side of the main cam gear 44, the slide lever 61 that engages with the cam groove 44b slides in the two directions of the arrow.

Therefore, the aforementioned ball moving mechanism 27 operates, and the guide balls 23. The arm 24.26 with the half-loading ball 25 rotates counterclockwise as shown in FIG. 5(A). Therefore, the guide ball 23 and the half loading ball 25 are displaced from the first unloading position shown in FIG. 1 to the second unloading position corresponding to the small tape cassette 3.

Therefore, when the small tape cassette 3 is lowered to a predetermined mounting position within the apparatus, the guide balls iob, i1b, the inclined ball 100.11C, the tension ball 13a, the guide ball 23. The half-loading balls 25 fit into the four parts 3f and 30.3h of the small cassette tape 3 shown in FIGS. 4(A) and 4(B).

Further, as the arm 24 rotates counterclockwise, the arm 36 having the light emitting element 35 rotates clockwise against the spring force of the spring 37. Therefore, the light emitting element 35 is also connected to the recess 3h of the small tape cassette 3 at the same time as the guide ball 23.
fit inside. Therefore, the light emitting element 35 does not get in the way when the small tape cassette 3 descends.

Further, as the small tape cassette 3 descends to the mounting position, the supply side reel stand 18a fits into the hub hole 3C. Further, a drive gear (not shown) disposed on the lower side of the chassis 4 moves, and this drive gear meshes with the winding-side gear 3d. Therefore, the reel on the winding side is driven by this drive gear to wind up the tape.

Next, when the small tape cassette 3 is installed at a predetermined installation position, the motor 38 rotates in the same manner as when the standard tape cassette 2 is installed, and the half-loading state shown in FIG. 13 is achieved. At this time, since the arms 24 and 26 rotate clockwise, the arm 36 having the light emitting element 35
is the original tape end detection position due to the spring force of the spring 37.
position).

Therefore, as described above, the tape end detection sensors 81 and 82 output a signal for detecting the tape end when the trailer tape or leader tape reaches between the light emitting element 35 and the light emitting element 35.

Furthermore, by operating the recording/playback mode, the same operation as with the standard tape cassette described above is performed.
The state shown in FIG. 14 is reached. In addition, in the fast forward 7 rewind mode, the half loading state shown in Fig. 13 will occur.
To run a tape at high speed without bringing it into sliding contact with a rotating drum 6 and a capstan 30.

Effects of the Invention As described above, in the magnetic recording/reproducing device according to the present invention, the light emitting element for detecting the end of the tape fits into the recess of the tape cassette installed in the device, depending on the size of the tape cassette. For example, even if standard tape cassettes or small tape cassettes of different sizes are selectively installed, the light emitting element does not get in the way, and tape cassettes of different sizes can be installed without any problem. Moreover,
When the light emitting element is displaced in accordance with the rotation of a lever having a ball or the like that guides the tape path, the light emitting element f can be displaced to a position corresponding to tape cassettes of different sizes with a relatively simple configuration. It has features such as being able to

[Brief explanation of the drawing]

Fig. 1 is a plan view of an embodiment of the magnetic recording/reproducing device according to the present invention, Fig. 2 is a side view thereof, Fig. 3 is a perspective view for explaining a standard tape cassette, and Fig. 4 is a small-sized 5 is a perspective view for explaining the tape cassette, FIG. 5 is a diagram showing the state when a small tape cassette is installed, FIG. 6 is a plan view showing the ring gear mechanism, FIG. 7 is a plan view of each ring gear, and FIG. The figure shows the cam groove on the bottom side of the main cam gear.
Fig. 9 is a cam diagram, Fig. 10 is a plan view showing the cam groove on the top side of the main cam gear, Fig. 11 is a rear view of the device as seen from the rear, and Fig. 12 is for explaining the operation of the tension arm. FIG. 13 is a plan view during half loading, and FIG. 14 is a plan view during recording/reproduction mode. DESCRIPTION OF SYMBOLS 1... Magnetic recording/reproducing device, 2... Standard tape cassette, 3... Small tape cassette, 6... Rotating drum, 7, 8... Guide groove, 9... Loading drive mechanism , io, 1i... tape loading member, 1
3... Tension arm, 13a... Tension ball, 15... Toggle member, 16... Brake band, 19... Full width erasing head, 23... Guide ball, 25... Half loading ball , 28...
Guard ball, 30... Capstan, 31... Pinch roller, 32... Pinch roller arm, 34...
・Pinch roller drive mechanism, 35... Light emitting element, 38.
...Motor, 44...Main cam gear, 44a, 44
b, 44c, 44d... cam groove, 45... sub cam gear, 45a... cam groove, 50... ring gear mechanism, 50a, 50b, 50c... ring gear, 61...
...Slide lever, 62...Swing arm, 70
...Slide lever, 71...Rotating member, 77...
・Up-down 7-m, 81.82... Tape end detection sensor. Patent applicant: Victor Japan Co., Ltd. Figure 7 (Al Figure 8)

Claims (1)

[Claims] A magnetic recording/reproducing device in which multiple types of tape cassettes of different sizes are selectively installed, wherein a light-emitting element that emits detection light is provided to a sensor for detecting a tape end on a tape cassette installed in the device. A magnetic recording/reproducing device characterized in that it is provided so as to be displaced to a position where it is inserted into each tape cassette depending on the type.